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US 5,294,522 AGranted
Photochromic compound
AssigneeChisso Corporation
InventorsManabu Uchida, Masahiro Irie
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AssigneeChisso Corporation
InventorsManabu Uchida, Masahiro Irie
Estimating the term…
A novel photochromic compound as a photoreactive material making use of photochromism is provided, which compound is expressed by the following formula (1) or (2)): ##STR1## wherein R is alkyl, alkoxy, perfluoroalkyl or cyano; X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 are each H, halogen, alkyl, alkoxy, cyano, alkanoyloxy or alkyloxycarbonyl, or a substituted or unsubstituted benzene ring is formed by condensation between at adjacent groups among X.sub.1 to X.sub.6 ; Y is Y.sub.1 C=CY.sub.2, O, S, SO, SO.sub.2 or NY.sub.3 wherein Y.sub.1 and Y.sub.2 are each as defined in the case of the above X.sub.1 to X.sub.6 and Y.sub.3 is H, alkyl, alkanoyl, alkyloxycarbonyl or aryl; and the symbol refers to occurrence of E- or Z-isomer, and which compound is useful as rewritable optical memory element or photo-display element and also as solar energy-storage material, duplicating material, masking material, optical filter, toys, etc.
A photochromic compound expressed by the formula (1) ##STR15## wherein R represents alkyl group, alkoxy group, perfluoroalkyl group or cyano group and X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 each independently represent hydrogen atom, halogen atom, alkyl group, alkoxy group, cyano group, alkanoyloxy group or alkyloxycarbonyl group, a substituted or unsubstituted benzene ring is formed by condensation between at X.sub.1 and X.sub.2, or/and between at X.sub.3 and X.sub.4, or/and between at X.sub.5 and X.sub.6 ;
Dependencies are inferred from the claim text.